I have using the Ula Airx for a while now, and this is by far the most comfortable backpack I have used. The pack is relatively large (I have packed for a 2 week trip carrying all my food and this was no problem at all) The large volume of the pack has both pros and cons, like everything else. I typically do not need that much space, but the pack is relatively compressible. My typical weight range is about 22-30 lbs for 3-5 backpacking trips and this pack handles this weight with such ease and comfort that i forget that I have it on. The pack moves very well, and the Kylmit sleeping pad creates an "airy" feeling in the backpanel which provides exceptional comfort. Anyways, backpacks are all personal. Some work great for some and not others. The ULA Airx is my go-to pack from anything from an overnighter to a thru-hike of the PNWT. Cheers!